Pneumatic door closer



May 20, 1930. H. J. LEBH ERZ 1,759,649

PNEUMATIC DOOR CLOSER Filed Aug. 11, 1928' IN VEN TOR.

1%???- J I e Zierz ATTORNEY videa simplified construc't1on of pneumatic Patented May 20, 1930 p um'rksofgsrnfrss PAN or FREDERICK, MARYLAND, A CORPORATION on MAn L nn PNnUMA'rIc noon oLosnB. v I

PAIR NT. m 'I HARR wmm pmm mca MARYLANDQASSIGNOR TO, THE nvnnnnr com; I

i Application filed August 11, 1928. Serial No. 299,064.

My invention relates .broadly to door closers and more particularly'to a constructlon of pneumatic door closing of doors. 7

One of the objects of my invention is to provide a construction of pneumatic door closer'of extremely simple construction and which iscapable of'man'ufacture at relatively small expense on a quantity production scale.

Another object of my invention is to prodoor closer wherein the pneumatic cylinder maybe 'rotatedabout 'a longitudlnal axis to selectively'adjust the rate of passage of air from the cylinder to regulate the movement of the dOOI'.

Still another object of my invention is to provide a construction of cylinder for pneumatic door closers where the cylinder'operativelyreceives a reciprocatory piston Wl'llCh connects tothe' door j amb to ;'Wl1i0l1 the door is hinged,the end of the cylinder belng screw threaded to engage 'a screw threaded socket member which is pivotally mounted upon the ner whereby the rate of passage of'air from the cylinder may be regulated by 'the se'lection'of the position of'the cylinder in thepivotally mountedsocket for permitting simple adjustment of the door closer-'afterthe 1nstallation thereof on a door. r

A still further objector my invention 1s to provide a construction of bracket mounting for a door closer by which adjustment may be made to properly alignthe door closer in position between a door jamb and the hinged door.

Other and further objects of my invention reside in-the construction ofthe silent door closer setuforth in the following specification and shown in the accompanying drawings:

Figure lis a plan view showing thep'neumatic door closer of my invention mounted device for cushioning the in position with respect to a hinged door and 5 door j amb ;v Fig. 2 is a front elevation showing the arrangement of the pneumatic door clos-j' er'installed with respect to a door; Fig.

is a fragmentary cross-sectional view taken through the end of the pneumatic cylinder and showing the construction of screw threaded socket which receives the screw; threaded end of the pneumatic 'cylinderfor l" permitting the requisite adj ustment'in rateof passage of air from the'cylinder;'-Fi g.'-4=

is a cross-sectional viewjof a modifiediorm ofairpassage for a silent door closer 'g and' Fig. 5 is across-sectional View taken through-7 the bracket mounting of the door'closer 11ne'5 5 of Fig. 2.

The pneumatic door closer of myp'resent invention is extremely simple in its construe-.1 tion and may be manufactured relatively in-Y expensively on a quantity production'b The door closer consists of a cylinder a piston member longitudinally operative therein, the piston member having a rod con ne'cted therethrough, which rod engages a bracket secured to the amb to which the door is hinged; Spring means are provided for normally, urging the door closer to a position, in which the door is closed with respect 'to'the 1 door jamb. The end of the cylinderisjscrew threaded to engage internal screw threads" carried by a socket memberywhiclrsocket member is arranged to be pivotally connected to a door, the door being hinged to the deer jamb on which the bracket mountingforthef door closer is located. The end of thecyling',

der is suitably apertured to permit passage I of air into or out of the cylinder at a piece;-

V termined rate for regulating the movement of the door with respect to the door'jambi The bracket member may be moved to a posii' tion for properly aligning'the door closer byg means of the arcuate shaped slots throughl' which the securing screws of the bracket are a passed.

By, revolving the cylinder as represented the arrows in Fig. 1, proper adjustment may be obtained for controlling the rate of move-" ment'of the door under theinfluence of'th'e'f 7 door closer.

'Referring to the drawing in more detail,

,20 r with the piston rod 12.. The bracket 15 1s reference character designates the doorjamb to which a door 2 is hinged as represented at I 3. A mounting device 4 is securedto the r taper'toreceive thescrewthreaded end '10 of v. the'cylinder 9. The screw'threads are 10' socket member '5; The oppositefend of the cap 11 through which the piston rod 12 passes. a

' 'ly-extending portion 13 thereon whlch passes through they bracket member '15. A sp ral door 2to which a socket member 5 is pivotally connected as shown at 6. The portion 7 of the socketmember 5 is provided with in- Theend of the piston rod'12 has a downward- V fspringilfi-has one end thereof engaged with through connections 17 and18c operates to bracket15asrepresented at 18 and the other ,arm, thereofengaged as represented at 17 provided with arcuate slots 19 inone wall thereof through which screw devices 1 2O 1 pass for securing the bracket to the door j amb 1. 'Byproviding the arcuate shaped slots 19 the screwsQO may be loosened and the bracket memb r mov d t th eq re g e for eceiving the end ot thepiston rod 12; The

piston-rod 12 carries piston 14 thereon which is" operative in the cylinder '9. Spring 16 constantlyurge piston rod 12 to a position away fromcthe deor 2,thereby maintaining the door in closed'position with respect tothe doorjamb.-. In order to provide for the pas- :sage for air into or out. of, the cylinder 9 the d 7 end wall 'of the cylindercat 21 is apertured ,as I shown at 22; By revolving cylinder 9 the fi p ld screw. threads 10 are adjusted in the 4 0: 7, i I or away from the extreme inner wallet the tapered screw threads 8 to a positiontoward socket member 5, thereby changing'the area' for the passage ofair into or out of the cylinder. When the cylinder 9 is screwed intoa Eosi'tion substantially within the socket meme er '5 the {rate of movement of air into orout ofjthe cylinder 9 is exceedingly small. If V the cylinder- 9 is revolvedlto arposition out of thescrewthreads 8a freer movement for the passage ot air. into Qor out of the cylinder "is obtained by, virtue of thesmaller number or n agi threadsatB and 10; It will be un-V derstoodlthat I'idepend' upon the leakage or:

entrance of air between the threads '8 andlO 1 to control" the rate of movement of thezdoonr ,In Fig, 4 I shaveshown a modified fo-irmof airpassagefor the end ofthe. pneumatic cyl operate with the conical shaped portion 23 of l wallyi l tot e e nzthel'mann a ne dle tinder. "The end-wallfll is provided with'an j inwardly projecting conicalqwall 23 atthe cg.

' disposed at the apex of the wall 23. The

centerthereof with a" central aperture24 sockt membe 5 is p ovi ed t a n l shap d c t alcpe n 25 dap d to o- ,the cylinder out of the socketmember 5 the follows valve for controlling the passage' jof air through the port 24. :By revolving the cyl- I inder 9the surface of the conical portion 25 of the socket member 5 engages the inwardlyprojecting wall 23, thereby decreasing the I V passage of air intoor out ofthe cylinder 9 and slowing down the movement of the door. However, as cylinder 9 is revolved to move area iotthe air passage is increased thereby lncreaslng the rate of movement of the door.

While I have described my invention in certain preferred embodiments I'desire that it be understood thatzmodifications may be made and that no limitations upon myinvention are intended other than are imposed- 'bythe scope ofthe appended claims.

, What I claim as new and desire'to secure; by Letters Patent of the 1. A door 1 closer comprising" rotatable cylinder, a' piston and vpiston rod operati-veQ UnitedQStates is as I in said cylinder, a socket member. having i 13" ternal screwvthreads cut therein on a taper-5.

the end of saidcylindergbeing screwthreaded on a tapercorresponding tothe taper oi-the T. lnternal screw threads in said-socket membefii, f the end wall of said cylinderbeing ported-tn 7 permit the passage ofair into or out of'said cylinder for leakage through thefthreadedL with said socket member,-the rate i leakage 95," connection'between the end of said cylinder of the air being predeterminedby rotatiolllroi said cylinder to a selectedpositionwithgre- V spect to said socket member. r

a piston and piston rod operative therein, means for pivotally connecting one, end of said piston rodfwitha doorjamb, one end i I 1 of said cylinder beingv screwj threaded, a;

'2. In a doorcloser a pneumatic cyllnder, 5

s'ocketymemberpivotallyconnected to a door hinged to the door jamb andhaving internal screw. threads therein engaging the screw 5 threads on the end of the cylinder, an inwardly extending projection formedon the lnterior wall of said socket member inaligng' ment with the central axis, of said cylinder] 9 and a correspondingly formed depression in.

' theend wall of said cylinder terminating in,

a port, said projection entering said 'depres-;

sion in selected amounts as said cylinder is i 'rotatedinto or out otsaid socketmember for r I. controllingv the passage of air into or. out of said cylinder at a predeterminedratefl A door closer comprising, a pneumatic cyllnder, aplston and piston. rod operative;

therein, the endor said cylinder being exterj nally screw threaded and provided with a; central conical shaped inward projection tere minat ng in a port, a socket member having internal screw threads cut tlierein to engage I the external screw'threads on the endofthe,

cylinder, a central inwardlyprojectingconi cal member integrally connected to saidsock- 6t m mbe nd rr ge t extend ,istoathe;

conical shaped inward projection in said cYlinder in selected amounts for predetermining HARRY J; LEBHERZ. 

